1. A programmable AC power distribution unit, comprising:a case, placed on a rack, the case having an accommodation space therein;
a panel, disposed at a front of the case, the panel being provided with a main switch, an emergency switch and a display screen, the main switch, the emergency switch and the display screen being electrically connected, the main switch being electrically connected in series with the emergency switch;
a front plate, disposed behind the panel and parallel to the panel, the front plate being located in the accommodation space of the case, the front plate including an insulating plate, the insulating plate having a plurality of first perforations at a middle portion thereof;
a back plate, disposed at a rear of the case, the back plate being parallel to the panel and the front plate, the back plate being provided with a plurality of output terminals, the back plate having a plurality of second perforations corresponding to the first perforations of the insulating plate, a portion of the back plate, where the second perforations are located, being made of an insulating material;
a bus bar assembly, having a first end transversely inserted through the first perforations and a second end inserted through the second perforations, the bus bar assembly being located in the accommodation space of the case, the second end of the bus bar assembly extending out of the back plate for connection of an external power supply;
a plurality of current detectors, fitted on the bus bar assembly, the plurality of current detectors being electrically connected with the panel respectively for detecting input current;
a plurality of electromagnetic switches, disposed in the accommodation space of the case and located at left and right sides of the bus bar assembly respectively, input ends of the electromagnetic switches being electrically connected with the bus bar assembly respectively, output ends of the electromagnetic switches being electrically connected with the output terminals of the back plate; and
a network connection and power parameter measuring circuit board, disposed at one side of the case, the network connection and power parameter measuring circuit board being electrically connected with the panel, the current detectors and the electromagnetic switches for measuring various power values of the external power supply.